Electrical-wiring apparatus.



A. MoMURTRIE.

ELECTRICAL WIRING APPARATUS.

APPLIOATION FILED JULY 18,1912.

1,049,752, Patented Jan. 7, 1913.

WITNESSES INVENTOR i5 of /@4 42217 5 aAA/max;

' ATTORNEY I UNITED STATES PATENT OFFICE.

' .ADNAH MOMURTRIE, on NEW YORK, N. Y., ASSIGNOR To THOMAS & BETTS comrANY,

or NEW YORK, N. Y., A CORPORATION on NEW YORK.

ELECTRICAL-WIRING APPARATUS.

Specification of Letters Patent.

Patented Jan. '7, 1913.

Toall whom it may concern:

Be t ltnown that I, ADNAH MCMURTRIE; a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Electrical- Wiring Apparatus, of which the following is a specification.

This invention relates to electrical wiring apparatus and particularly to apparatus adapted to be employed at the end of a conduit for electric conductors Where the conductors are led out from the conduit to a suitable lighting or other translating device. The invention is directed to the provision of improved apparatus for use in this Way so constructed that it may be readily manipulated in securing it to theconduit and detaching it therefrom, that. it. will be firmly held in position upon the end of the conduit and that it will hold the conductors properly separated and insulated one from an other.

When installing electric lighting apparat cs in a building, condu'ts are employed for the conductors and where the conductors emerge from the conduits it is necessary to so support them as toprevent abrasion of their insulation and consequent short-circuiting. Outlet boxes are commonly employed into which the conduits run and to which the ends of the conduits are secured. In some cases, however, the use of such an outlet box is undesirable or impossible and for such cases it has been proposed to apply a head formed of insulating material, to

the end of the conduit, this head being provided with separated openings through which the conductors are led.

The present invention relates to apparatus of this character and involves the "provision of an improved form of insulat mg head for application to the end of a conduit and improved means for securing the head to the end of the conduit.

The preferred embodiment of the invention is illustrated in the accompanying drawings in which-- w Figure 1 is an elevation of apparatus embodying the invention, Fig. 21s a central section of the parts shown in Fig. 1, Fig. 3 is a plan view of the insulating head, Fig. 4 is a perspective 'view of the member for securing the head to the conduit and Fig.

each of which one of the 5 is a view similar to Fig. 2 illustrating a modification.

Referring to these drawings, a conduit of the usual or any suitable construction is shown at 6, this being provided with a threaded end 7. Electrical conductors are run through the conduit 6 and emerge from the end 7 thereof, from which .end they lead to an electric light or other translating device. If no meanswere provided for supporting and separating the conductors, the insulation thereof might become abraded by rubbing against theend of the conduit and short-circu'iting might result.

To avoid this, a head '8, formed of 'insulat lng material, is applied to the end ofthe conduit 6, this head being provided with separated openings 9 therethrough, through end of the conduit is inserted in the dep-ression, said end will abut against the shoulder and the portion of the conduit adjacent to the end will be inclosed by the portion of the head about said depression. On the exterior of the head is a circumferential shoulder 11, preferably provided by. forming a circumferential groove in the exterior of the head.

The head must be so arranged that it can be readily mounted upon the end of the conduit 6 but in so mounting it the head cannot be rotated because the conductors are inserted through them enings 9 in the head before the latter is see red upon the conduit. I therefore employ, as a means for securing the head upon the conduit, a member adapted to be mounted upon the conduit and secured to the head but rotatable relatively to the head, so that though the head is not turned, the member may be rotated'so as to cause it to engage the threads on the end of the conduit. This member is shown at 12. It consists of a piece of metal in the form of a washer having a plurality of inelectrical conduc- 'der 11 on the head 8. The construction of this member is shown in Fig. 4. Preferably the conductors passing through the head are a member for securing the head to theconduit. is formed in twoparts so that the arms 13 1projeotionsl may be made of light secured to a nut 15 so as'to. rota-tewith the nut, the nut being provided with threads for on aging. thethreadsofthe conduit.

tegral'projections 13 which are bent at a' right angle to the body of the member 12 and have their ends 14 turned inwardly at a right angle so as to coaot with the shoul-" three of the projections 13 are provided on the member 12, these three being arranged with two of them diametrically opposite each other and the third preferably midway between the other two.

In assembling the parts, the member 12 is mounted upon the member 8 with the ends 14 of the-fingers 13 engagin the shoulder 11K The conductors are tien passed through the opening in member 12 and the separated openings 9' in the head 8. The member 12 1s then'threaded upon the end 7 of the conduit 6 by bein turnd relatively to the head and the'con uit, and in doing so the end of the conduit enters the depression in the head untilthe parts are finally in the relative posit-ions in which the are shown in Figs. 1 and 2. While this is ing done, the head 8 is not rotated and therefore not twisted. 'Also, when the parts have reached'their final positions with the end of the conduit projecting within the head, the conduit holds the head. against movement. transverse to the axis of the conduit.

Fig. 5 shows a slight modification of the construction above described in that the and meta The-"part1 including these arms is 1th the construct-ion above described,

the head is held; securely upon the conduit and may be readily detached therefrom or the member 12 can be shaped to its final form before assembling it and the head" with which it is employed.

Having now described my invention, What I claim as new therein and desire to secure by Letters Patent of the United States is a The combination with a conduit for electrical conductors having a threaded end, of a head of larger diameter than said conduit, formed of insulatin .material and havin an exterior circumerential groove, sai head being provided with a circular depression in one end thereof into which the end of the .conduit fits, a shoulder in the wall of the de ression against which the end of the conduit abuts and openings leading from the bottom of the depression through the head, and a metallic member having a threaded openin to receive the threaded end of the conduit and provided with arms which are bent to extendialong the surface of the portion of the head inclosing the end of the conduit, and which have their ends turned. inwardly to enter saidcirciimferential groove in the head, said member being rotatable independently of the head while screwing it upon the end of the conduit, substantially as set forth.

his specification signed and witn'esse this 16th day of July, 1912.

- p v ADNAH MoMURTRIE. Witnesses:

. H, .Mo CoRM oK,

D. S.-E M

" 001.10: a; thin patent may be obtained for five cents each, by'a'ddressing the Commissioner of Patents.

Washington, 1).. G. 

